:root {
  --bg: #080b14;
  --panel: #0e121f;
  --line: #1c2436;
  --blue: #3fa9f5;
  --blue-glow: #5ac8fa;
  --red: #f0475a;
  --red-glow: #ff6b7f;
  --white: #f5f7fa;
  --muted: #7c88a0;
  --font-display: "Bebas Neue", sans-serif;
  --font-body: "Manrope", sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background:
    radial-gradient(
      circle at 15% 15%,
      rgba(63, 169, 245, 0.1) 0%,
      transparent 45%
    ),
    radial-gradient(
      circle at 85% 85%,
      rgba(240, 71, 90, 0.1) 0%,
      transparent 45%
    ),
    var(--bg);
  font-family: var(--font-body);
  color: var(--white);
  padding: 24px;
}

@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}

.frame {
  width: 100%;
  max-width: 760px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 22px;
  box-shadow:
    0 30px 80px -30px rgba(63, 169, 245, 0.25),
    0 30px 80px -30px rgba(240, 71, 90, 0.15);
  padding: 34px 36px 30px;
}

/* ---------- title ---------- */

.title-block {
  text-align: center;
  margin-bottom: 20px;
}

.game-title {
  font-family: var(--font-display);
  font-size: clamp(2.6rem, 8vw, 3.8rem);
  letter-spacing: 0.03em;
  margin: 0 0 14px;
}
.game-title .word {
  margin: 0 6px;
}
.word.blue {
  color: var(--blue-glow);
  text-shadow: 0 0 18px rgba(90, 200, 250, 0.5);
}
.word.white {
  color: var(--white);
  text-shadow: 0 3px 0 rgba(0, 0, 0, 0.35);
}
.word.red {
  color: var(--red-glow);
  text-shadow: 0 0 18px rgba(255, 107, 127, 0.5);
}

.subtitle-banner {
  display: inline-block;
  background: #05070c;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 8px 22px;
  font-family: var(--font-display);
  font-size: 1.15rem;
  letter-spacing: 0.05em;
  transform: skewX(-6deg);
}
.subtitle-banner span {
  display: inline-block;
  transform: skewX(6deg);
}
.subtitle-banner .white {
  color: var(--white);
  margin-right: 8px;
}
.subtitle-banner .red {
  color: var(--red-glow);
}

/* ---------- layout ---------- */

.content {
  display: grid;
  grid-template-columns: 1fr 1.15fr;
  gap: 32px;
  align-items: start;
  margin-bottom: 22px;
}

@media (max-width: 680px) {
  .content {
    grid-template-columns: 1fr;
  }
}

/* ---------- feature list ---------- */

.feature-list {
  list-style: none;
  margin: 8px 0 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.feature {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding-bottom: 16px;
  border-bottom: 1px dashed var(--line);
}
.feature:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.feature-icon {
  flex: none;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
}
.feature-icon svg {
  width: 20px;
  height: 20px;
}
.feature-icon.blue {
  background: linear-gradient(160deg, var(--blue), #1d6fb8);
  box-shadow: 0 0 16px rgba(63, 169, 245, 0.45);
}
.feature-icon.red {
  background: linear-gradient(160deg, var(--red), #b01f30);
  box-shadow: 0 0 16px rgba(240, 71, 90, 0.45);
}

.feature strong {
  display: block;
  font-size: 0.98rem;
  letter-spacing: 0.02em;
  text-transform: uppercase;
  font-weight: 800;
}
.feature strong.blue {
  color: var(--blue-glow);
}
.feature strong.red {
  color: var(--red-glow);
}

.feature p {
  margin: 2px 0 0;
  font-size: 0.88rem;
  font-weight: 700;
  color: var(--white);
  opacity: 0.85;
}

/* ---------- game panel ---------- */

.game-panel {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.status {
  font-weight: 700;
  font-size: 1.02rem;
  margin: 0 0 16px;
  text-align: center;
  min-height: 1.4em;
}
.x-color {
  color: var(--blue-glow);
}
.o-color {
  color: var(--red-glow);
}

.board-wrap {
  position: relative;
  width: 100%;
  max-width: 320px;
}

.board {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
  background: var(--line);
  padding: 8px;
  border-radius: 16px;
  border: 1px solid var(--line);
  box-shadow:
    0 0 0 1px rgba(255, 255, 255, 0.03),
    0 20px 40px -20px rgba(0, 0, 0, 0.6);
}

.cell {
  aspect-ratio: 1 / 1;
  background: #060911;
  border: none;
  border-radius: 10px;
  font-family: var(--font-display);
  font-size: 2.6rem;
  font-weight: 400;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  color: transparent;
  transition: background 0.12s ease;
  padding: 0;
}
.cell:not(:disabled):hover {
  background: #0b1120;
}
.cell:disabled {
  cursor: default;
}

.cell.x {
  color: var(--blue-glow);
  text-shadow: 0 0 14px rgba(90, 200, 250, 0.6);
}
.cell.o {
  color: var(--red-glow);
  text-shadow: 0 0 14px rgba(255, 107, 127, 0.6);
}

.cell.win {
  background: #0b1120;
}

.win-line {
  position: absolute;
  top: 0;
  left: 0;
  height: 6px;
  width: 0;
  border-radius: 4px;
  background: linear-gradient(90deg, var(--blue-glow), var(--red-glow));
  box-shadow:
    0 0 14px rgba(255, 107, 127, 0.7),
    0 0 14px rgba(90, 200, 250, 0.7);
  transform-origin: left center;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s ease;
}
.win-line.show {
  opacity: 1;
}

/* ---------- scoreboard ---------- */

.scoreboard {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
  width: 100%;
  max-width: 320px;
  margin-top: 20px;
}

.score-chip {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  padding: 10px 6px;
  border-radius: 10px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.02);
}
.score-chip.x {
  box-shadow: inset 0 0 0 1px rgba(63, 169, 245, 0.25);
}
.score-chip.o {
  box-shadow: inset 0 0 0 1px rgba(240, 71, 90, 0.25);
}

.score-label {
  font-size: 0.66rem;
  font-weight: 800;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--muted);
}
.score-chip.x .score-label {
  color: var(--blue-glow);
}
.score-chip.o .score-label {
  color: var(--red-glow);
}

.score-value {
  font-family: var(--font-display);
  font-size: 1.5rem;
}

/* ---------- restart button ---------- */

.restart-btn {
  margin-top: 20px;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-body);
  font-weight: 800;
  font-size: 0.85rem;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  color: #05070c;
  background: linear-gradient(120deg, var(--blue-glow), var(--red-glow));
  border: none;
  border-radius: 10px;
  padding: 12px 22px;
  cursor: pointer;
  transition: transform 0.12s ease;
}
.restart-btn svg {
  width: 16px;
  height: 16px;
}
.restart-btn:hover {
  transform: translateY(-1px);
}
.restart-btn:active {
  transform: translateY(0);
}

/* ---------- tagline ---------- */

.tagline {
  text-align: center;
  margin: 26px 0 0;
  font-weight: 800;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  font-size: 0.88rem;
  color: var(--white);
  opacity: 0.9;
}
.tagline .blue {
  color: var(--blue-glow);
}
.tagline .red {
  color: var(--red-glow);
}